光纤光栅激光器激射波长的研究

一般认为，用光纤光栅作选频元件的光纤激光器，激射波长与光纤光栅中心反射波长一致，本文报道了不同的实验研究结果。通过细致的实验研究，发现光纤光栅激光器激射波长相对于光纤光栅中心反射波长有一定的偏移。激射波长可以出现在光栅中心反射波长的长波端，也可以出现在其短波端。对不同腔结构的掺镱、掺铒光纤光栅激光器的深入研究证明，谐振腔的各向异性对激光器的激射波长偏移起到决定性的作用，波长最大偏移量主要受限于光纤光栅的反射带宽。通过激光腔内的偏振控制器改变谐振腔的各向异性，可以在光纤光栅的反射带宽内控制激射波长的位置。

Research on Lasing Wavelength of Fiber Grating Laser

In the research work of fiber Bragg grating (FBG) based lasers, it was found out that the lasing light shifted away from the Bragg wavelength of the FBG. The lasing wavelength can either be longer or shorter than the Bragg wavelength of the FBG. Further study on erbium- and ytterbium\|doped fiber grating lasers with both ring and linear cavity has shown that, the phenomenon of wavelength shift was caused by the anisotropy of the laser cavity. The maximum wavelength shifting value was limited mostly by the bandwidth of the fiber grating. Through the online polarization controller, the lasing wavelength can be controlled within the bandwidth of the FBG.